一种改进的MIMO中继系统中比特与功率分配算法  

A modified bit and power allocation algorithm for MIMO relay system

作　　者：吕娟 张丹[2] 王蒙军[2] 刘剑飞[2] 

机构地区：[1]河北省通信管理局,河北石家庄050021 [2]河北工业大学信息工程学院,天津300401

出　　处：《重庆邮电大学学报（自然科学版）》2012年第5期595-598,609,共5页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：奥维通信有限公司对本课题的资助

摘　　要：比特和功率分配是基于正交频分复用的多输入多输出(multiple input multiple output-orthogonal frequency divisionmultiplexing,MIMO-OFDM)系统自适应资源分配中的一个重要研究问题。针对单用户MIMO放大转发中继系统中功率分配的问题,提出了基于注水定理的比特和功率分配算法,算法采用对分法搜索注水线,相对于传统的注水算法,减少了迭代次数,复杂度较低。仿真结果表明,该算法能够有效提高系统谱效率,并且在误码率性能上也有一定的提高。Bit and power allocation is an important issue of adaptive resource allocation in MIMO-OFDM system.In this paper,an improved algorithm,bits and power allocation algorithm based on water-filling theorem,is proposed and used to the single-user MIMO amplify-and-forward relay system.The algorithm which adopts the method of bisection to search water-filling line can reduce the number of literations with low complexity compared with the traditional water-filling algorithm.Simulation results show that system capacity and bit error rate performance can be improved effectively.

关 键 词：MIMO中继系统 注水定理 比特功率分配 系统谱效率 

分 类 号：TN929.5[电子电信—通信与信息系统]